Mate in 3 · No. 13 · ~900 · Check

Two rooks and bishop

White to play and mate in three.

Position

White
king on h8, rooks on d3 and g6, bishop on b1, pawns on a4, d2 and g2
Black
king on c8, rook on c7, bishops on c5 and c6, knight on a8, pawns on b5, b7, f5, f6 and f7